土坡悬臂式抗滑桩一种抗震设计计算方法

肖世国;祝光岑

【期刊名称】《工程地质学报》 【年(卷),期】2016(024)005

【摘 要】在强震动力作用下，边坡常会产生较大的永久位移，且抗滑桩锚固段顶端前侧局部地层易进入塑性屈服状态，这在传统的悬臂式抗滑桩抗震设计计算中没有给予充分考虑。基于 Nemark 滑块位移法和极限分析原理，提出了考虑边坡设计安全系数和地震永久位移的作用于抗滑桩上设计滑坡推力的计算方法；同时，根据锚固段地层进入塑性屈服状态的情况提出把锚固段分为塑性区锚固段和弹性区锚固段分别计算，前者按极限地层反力法采用悬臂梁模型计算，后者按照弹性地基梁模型计算，在两者界面处需满足桩体内力和变形以及地层反力的连续条件。结合一土质边坡工程算例，给出了所提出的悬臂式抗滑桩抗震设计三段分析法的具体计算过程和结果，进一步表明所提出的方法具有技术合理性和经济性。%Permanent displacement and plastic zone in the stable strata of a soil slope occur generally in the slope reinforced by stabilizing piles under the condition of intensive seismic action.However,the two important factors are usually omitted in the traditional aseismic design and analysis for slopes with cantilever-type stabilizing piles.Based on the principle of the rigid Newmark sliding model and limit analysis,the computational method is proposed that engineered landslide thrust on a stabilizing pile can be determined,by taking into consideration design safety factor and permanent displacement of the slope with piles.Meanwhile,according to

the condition that some area in the stable strata of the slope is in the plastic state,the section of a stabilizing pile in the stable strata can be further divided into the segment in plastic zone of the strata and the segment in elastic zone of the strata.Therefore,the former can be regarded as cantilever beam model with uniformly lateral limit ground reaction;the latter can be analyzed by use of elastic foundation beam model.Their continuous conditions including internal forces and deformation of a pile and lateral ground reaction should be met at the interface between the two segments.The proposed method is demonstrated by a soil slope engineering example,in which calculation procedure and corresponding results are given in detail by the three section analysis method for the aseismic design of a cantilever-type stabilizing pile.The results show further that the proposed method is reasonable and cost effective. 【总页数】6页(P1022-1027) 【作 者】肖世国;祝光岑

【作者单位】西南交通大学地质工程系 成都 610031; 西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室 成都 610031;西南交通大学岩土工程系 成都 610031 【正文语种】中 文 【中图分类】TU443 【相关文献】

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3.一种改进的预应力锚索抗滑桩设计计算方法 [J], 周文权;言志信;王长征;刘子振 4.悬臂式抗滑桩受力特性分析及桩间距计算 [J], 林斌;李怀鑫;范登政;王鹏 5.悬臂式抗滑桩三维土拱效应及桩间微桩加固作用机制研究 [J], 黄达;冯开;宋宜祥

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